No need for stress on this. carrots0066 sounds like things went fine for you, so good luck.
Overall, for others, I would think something simple would be good in this context, so that the interviewer can kind of glance at it. Rather than a lot of detail. My kid didn’t bring anything because no one asked. The interview was a wide-ranging conversation. I would think a discussion of activities could be kind of deadly honestly : )
To anyone doing an interview, remember you are also interviewing the school so make sure it is a fit.